That chart sums it up, yeah, but essentially "Litverse" or "Novelverse" are common names for the set of interconnected novels that kicked off with the DS9 Relaunch. A significant percentage of the books since then have been in continuity with one another (and some older novels have been retroactively tied in as well, such as Vendetta or the New Frontier series), referencing one another and making effort to be consistent with one another, forming essentially a Star Trek EU.